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HT66F4530 Datasheet(PDF) 52 Page - Holtek Semiconductor Inc |
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HT66F4530 Datasheet(HTML) 52 Page - Holtek Semiconductor Inc |
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52 / 224 page  Rev. 1.00 5� De�e��e� �1� �01� Rev. 1.00 53 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers High Speed Os�illato�s FHS P�es�ale� fH fH/� fH/4 fH/8 fH/1� fH/3� fH/�4 CKS�~CKS0 fSYS Low Speed Os�illato�s FSS fSUB fSUB WDT fLIRC IDLE� SLEEP IDLE0 SLEEP HXT HIRC HXTEN HIRCEN LXT LIRC LXTEN System Clock Configurations External Crystal/Ceramic Oscillator – HXT TheExternalCrystal/CeramicSystemOscillatorisoneofthehighfrequencyoscillators.Formost crystaloscillatorconfigurations,thesimpleconnectionofacrystalacrossOSC1andOSC2will createthenecessaryphaseshiftandfeedbackforoscillation,withoutrequiringexternalcapacitors. However,forsomecrystaltypesandfrequencies,toensureoscillation,itmaybenecessarytoadd twosmallvaluecapacitors,C1andC2.Usingaceramicresonatorwillusuallyrequiretwosmall valuecapacitors,C1andC2,tobeconnectedasshownforoscillationtooccur.ThevaluesofC1and C2shouldbeselectedinconsultationwiththecrystalorresonatormanufacturer’sspecification. Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall locatedasclosetotheMCUaspossible. Note: 1. RP is no��ally not �equi�ed. C1 and C� a�e �equi�ed. �. Although not shown OSC1/OSC� pins have a pa�asiti� �apa�itan�e of a�ound 7pF. To inte�nal �i��uits Internal Oscillator Circuit C1 C� OSC1 OSC� RF RP Crystal/Resonator Oscillator – HXT Crystal Oscillator C1 and C2 Values Crystal Frequency C1 C2 1�MHz 0pF 0pF 8MHz 0pF 0pF �MHz 0pF 0pF 4MHz 0pF 0pF 1MHz 100pF 100pF Note: C1 and C� values a�e fo� guidan�e only. Crystal Recommended Capacitor Values |
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